Please make sure you password your WiFi in your car. Yesterday coming out from shopping, I met an old friend and we started chatting right as I was about to enter the car. Conversation evolved to exchanging info. Much to my surprise when I looked at my iPhone, I saw the WiFi bars active. Scratching my head I went into settings and lo and behold my car WiFi was connected. The car at this time has been parked with the engine off for at least half an hour while I went into the store. I am guessing the modem in the trunk was wired live at all times.